To treat frozen shoulder with physical therapy, start with gentle range-of-motion exercises like pendulum swings and arm circles to reduce stiffness. Gradually progress to stretching exercises to improve flexibility, focusing on shoulder elevation and rotation. Strengthen the surrounding muscles with isometric exercises as mobility improves. Heat therapy can be used before stretching to loosen tight muscles, while cold therapy afterward helps reduce inflammation. Progress slowly, respecting pain limits, to regain full shoulder function over time.